Electric field paper stabilizing system for an electrographic plotter, printer or the like
US5003325A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 22, 1990 |
| Grant date | Mar 26, 1991 |
| Priority date | — |
| Expiry date | Jan 22, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G2215/00814
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An electric field paper stabilizing system for an electrographic plotter, printer, or the like includes a continuous transport belt for passing a recording medium in substantially a complete revolution past a writing head. The belt is conductive or has a conductive surface conformably coated with a minimally thin dielectric material of high dielectric strength and permittivity. A recording medium such as electrostatic writing paper has a conductive surface adjacent the dielectric coating on the conductive transport belt. Electrode means are provided in the dielectric coating for holding the paper at ground potential. A differential potential is applied between the back side of the paper and the conductive transport belt whereby the paper and belt function as parallel conductive plates of a capacitor. The electric field developed between the conductive paper and the belt provides a strong hold down force which immovably registers the paper to the belt. Because the entire back side of the paper is conductive and held at ground potential, the conductive side of the paper acts as a ground plane, preventing the strong electric field from interfering with other electric fields from the w…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.